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We define x as the number that we are looking for
now, we will write the equation following the conditions that they give us
[tex]4-x=17[/tex]Now we pass -x to the right with opposite sign, and 17 to the left with opposite sign
[tex]4-17=x[/tex]The we solve the substraction and we have
[tex]x=-13[/tex]Finally, we can check if our answer actually fulfill the conditions given below
[tex]4-(-13)=\text{ 17}[/tex]